Apple Safari 19 excels in energy efficiency and privacy, making it a solid choice for macOS and iOS users. Mozilla Firefox 125 offers extensive customization and cross-platform compatibility, appealing to users who value flexibility and broader device support.
| Attribute | Apple Safari 19 | Mozilla Firefox 125 |
|---|---|---|
| JavaScript Engine Performance (Speedometer 3.0 score) | While a specific score for Safari 19 isn't available, reports from 2025 indicate that Safari generally has very high JavaScript performance. | Actively working on Speedometer 3.0 performance; Parallel Marking reduces GC time by 20-30% |
| Memory Usage (RAM consumption with 10 tabs open) | RAM usage varies significantly based on the content of the tabs. Safari will try to keep websites in memory, using more RAM with many tabs open, but it automatically reduces its memory footprint when the system requires it. | Not available |
| CPU Usage (during video playback at 1080p) | Safari is known for its energy efficiency, resulting in lower CPU usage during video playback compared to some other browsers. | 25-28% GPU usage reported vs 15-17% in Chrome; can be mitigated by enabling hardware acceleration |
| HTML5 Support (score on HTML5test.com) | No specific score is available for Safari 19. | Not available |
| WebAssembly Performance (execution time of a standard benchmark) | Safari supports WebAssembly for high-performance code execution. | Improvements to WebAssembly (Wasm) garbage collection (GC) array performance |
| Extension Availability and Variety | Safari has a smaller selection of extensions compared to Firefox and Chrome. | Wide variety of extensions available |
| Privacy Features (Intelligent Tracking Prevention, Enhanced Tracking Protection) | Intelligent Tracking Prevention (ITP) is enabled by default, using machine learning to block cross-site tracking. Enhanced Tracking Protection minimizes data passed to third parties. Private Browsing offers advanced tracking and fingerprinting protections. Hides IP address from trackers. Limits data collected by search engines. | Enhanced Tracking Protection (ETP) blocks social media trackers, cross-site tracking cookies, fingerprinters, cryptominers, and tracking content; offers 'Do Not Track' feature |
| Security Features (sandboxing, vulnerability exploit mitigation) | Sandboxing to isolate website code and prevent it from accessing other parts of the system. Vulnerability exploit mitigation. | Uses sandboxing to isolate running processes; security updates released to address vulnerabilities |
| Cross-Platform Compatibility (macOS, Windows, Linux, iOS, Android) | Primarily macOS and iOS. | Available for Windows 10 or later, macOS, Linux, Android, and iOS (on iOS, uses the WebKit layout engine) |
| User Interface Customization Options | Safari offers some customization, but is less customizable than Firefox. | Extensive customization options, including toolbar layout, configurable settings, themes and extensions; advanced customization via `about:config` and custom style rules |
| Accessibility Features (reader mode, zoom levels, voice control) | Reader mode to remove ads and distractions. Zoom levels. Voice Control. VoiceOver screen reader. Increase Contrast. Accessibility Reader (coming later in 2025) for font, text size, and color customization. | Not available |
| Battery Consumption (on laptops during typical browsing) | Generally very battery friendly. | Safari is often more battery-friendly, especially for video playback; for general browsing, Firefox's battery consumption can be comparable to Safari |